diff --git a/planck_2020_lollipop/_lollipop.bibtex b/planck_2020_lollipop/_lollipop.bibtex
index 35d5e5c..9bd3ab7 100644
--- a/planck_2020_lollipop/_lollipop.bibtex
+++ b/planck_2020_lollipop/_lollipop.bibtex
@@ -1,6 +1,27 @@
-Planck low-multipole Lollipop likelihood from \cite{Mangilli_2015}
+Planck low-multipole Lollipop likelihood from \cite{Tristram:2021}
+using on approximation of the likelihood based on \cite{Hamimeche:2008,Mangilli:2015}
 
-@article{Mangilli_2015,
+
+@ARTICLE{Tristram:2021,
+       author = {{Tristram}, M. and {Banday}, A.~J. and {G{\'o}rski}, K.~M. and {Keskitalo}, R. and {Lawrence}, C.~R. and {Andersen}, K.~J. and {Barreiro}, R.~B. and {Borrill}, J. and {Eriksen}, H.~K. and {Fernandez-Cobos}, R. and {Kisner}, T.~S. and {Mart{\'\i}nez-Gonz{\'a}lez}, E. and {Partridge}, B. and {Scott}, D. and {Svalheim}, T.~L. and {Thommesen}, H. and {Wehus}, I.~K.},
+        title = "{Planck constraints on the tensor-to-scalar ratio}",
+      journal = {\aap},
+     keywords = {cosmology: observations, cosmic background radiation, cosmological parameters, gravitational waves, methods: data analysis, Astrophysics - Cosmology and Nongalactic Astrophysics},
+         year = 2021,
+        month = mar,
+       volume = {647},
+          eid = {A128},
+        pages = {A128},
+          doi = {10.1051/0004-6361/202039585},
+archivePrefix = {arXiv},
+       eprint = {2010.01139},
+ primaryClass = {astro-ph.CO},
+       adsurl = {https://ui.adsabs.harvard.edu/abs/2021A&A...647A.128T},
+      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
+}
+
+
+@article{Mangilli:2015,
    title={Large-scale cosmic microwave background temperature and polarization cross-spectra likelihoods},
    volume={453},
    ISSN={1365-2966},
@@ -14,3 +35,23 @@ Planck low-multipole Lollipop likelihood from \cite{Mangilli_2015}
    month={Sep},
    pages={3175–3190}
 }
+
+@ARTICLE{Hamimeche:2008,
+       author = {{Hamimeche}, Samira and {Lewis}, Antony},
+        title = "{Likelihood analysis of CMB temperature and polarization power spectra}",
+      journal = {\prd},
+     keywords = {98.70.Vc, Background radiations, Astrophysics},
+         year = 2008,
+        month = may,
+       volume = {77},
+       number = {10},
+          eid = {103013},
+        pages = {103013},
+          doi = {10.1103/PhysRevD.77.103013},
+archivePrefix = {arXiv},
+       eprint = {0801.0554},
+ primaryClass = {astro-ph},
+       adsurl = {https://ui.adsabs.harvard.edu/abs/2008PhRvD..77j3013H},
+      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
+}
+
diff --git a/planck_2020_lollipop/lollipop.py b/planck_2020_lollipop/lollipop.py
index c65c80f..30d0248 100644
--- a/planck_2020_lollipop/lollipop.py
+++ b/planck_2020_lollipop/lollipop.py
@@ -187,7 +187,7 @@ def get_requirements(self):
         return dict(Cl={mode: self.bins.lmax for mode in ["ee", "bb"]})
 
     def logp(self, **params_values):
-        cl = self.theory.get_Cl(ell_factor=False)
+        cl = self.provider.get_Cl(ell_factor=False)
         return self.loglike(cl, **params_values)
 
     def loglike(self, cl, **params_values):
@@ -219,7 +219,7 @@ def is_installed(cls, **kwargs):
 
 class lowlEB(_LollipopLikelihood):
     """
-    Low-L Likelihood for Polarized Planck for EE+BB+EB
+    Low-L Likelihood for Polarized Planck EE+BB+EB
     Spectra-based likelihood based on Hamimeche-Lewis for cross-spectra
     applied on CMB component separated map
     """
@@ -227,7 +227,7 @@ class lowlEB(_LollipopLikelihood):
 
 class lowlE(_LollipopLikelihood):
     """
-    Low-L Likelihood for Polarized Planck for EE
+    Low-L Likelihood for Polarized Planck EE
     Spectra-based likelihood based on Hamimeche-Lewis for cross-spectra
     applied on CMB component separated map
     """
@@ -235,7 +235,7 @@ class lowlE(_LollipopLikelihood):
 
 class lowlB(_LollipopLikelihood):
     """
-    Low-L Likelihood for Polarized Planck for BB
+    Low-L Likelihood for Polarized Planck BB
     Spectra-based likelihood based on Hamimeche-Lewis for cross-spectra
     applied on CMB component separated map
     """